1708 + Interview Questions in Chemistry Page 10 InterviewSolution

451.	Consider the following transformations. H−C≡C−CH2−CH2−CH3→H3C−CH=CH−CH2−CH3Which reaction sequence will bring about the above transformation?
Answer» Consider the following transformations. $H - C \equiv C - C H_{2} - C H_{2} - C H_{3} \to H_{3} C - C H = C H - C H_{2} - C H_{3}$ Which reaction sequence will bring about the above transformation?

Discussion

452.	The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is
Answer» The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is

452.

The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is

Answer»

The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is

Discussion

453.	When 3, 3-dimethyl-2-butanol is heated with H2SO4the major product obtained is
Answer» When 3, 3-dimethyl-2-butanol is heated with $H_{2} S O_{4}$ the major product obtained is

Discussion

454.	Which of the assumption of the kinetic - molecular theory best explains Daltons law of partial pressure?
Answer» Which of the assumption of the kinetic - molecular theory best explains Daltons law of partial pressure?

Discussion

455.	Which of the following is the correct statement for red lead
Answer» Which of the following is the correct statement for red lead

455.

Which of the following is the correct statement for red lead

Answer»

Which of the following is the correct statement for red lead

Discussion

456.	Calculate the wavelength of a photon having an energy of 3 eV. Take h=6.6×10−34 Js
Answer» Calculate the wavelength of a photon having an energy of 3 eV. Take $h = 6.6 \times 10^{- 34} J s$

Discussion

457.	An organic compound contains C,H and S the minimum molecular weight of the compound containing 10% sulphur is : (atomic weight of S=32 amu)
Answer» An organic compound contains C,H and S the minimum molecular weight of the compound containing 10% sulphur is : (atomic weight of S=32 amu)

Discussion

458.	Which of the following is not an ore of copper?
Answer» Which of the following is not an ore of copper?

Discussion

459.	For the reaction CaCO3(s) ⇋ CaO(s) + CO2(g) the partial pressure of CO2 (at equilibrium) depends on:
Answer» For the reaction $C a C O_{3}$ (s) $⇋$ $C a O$ (s) + $C O_{2}$ (g) the partial pressure of $C O_{2}$ (at equilibrium) depends on:

Discussion

460.	Enthalpy change for the reaction H+(aq)+OH−(aq)⟶H2O(l) IS−57.3 kJ mol−1. If 1 L of 0.5 MJNO3 is mixed with 2L of 0.1 MKOH, the enthalpy change would be
Answer» Enthalpy change for the reaction $H_{(a q)}^{+} + O H_{(a q)}^{-} ⟶ H_{2} O_{(} l) I S - 57.3 k J m o l^{- 1} .$ If 1 L of $0.5 M J N O_{3}$ is mixed with 2L of 0.1 MKOH, the enthalpy change would be

Discussion

461.	By the reduction of alkyl halides, we get alkanes. The best alkyl halide is
Answer» By the reduction of alkyl halides, we get alkanes. The best alkyl halide is

Discussion

462.	Assertion (A): Hydrogen resembles alkali metals. Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K). Choose the most appropriate of the following:
Answer» Assertion (A): Hydrogen resembles alkali metals. Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K). Choose the most appropriate of the following:

Discussion

463.	In a reaction, A+B→ Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as :
Answer» In a reaction, $A + B \to$ Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as :

Discussion

464.	d(ΔG)=−(ΔSreaction).dT ΔG=ΔH−TΔS ΔG=ΔH+T(d(ΔG)dT)PAt 300 K,ΔH for the reaction,Zn(S)+2AgCl(S)→ZnCl2(aq)+2Ag(S)is −218 kJ/mol while the e.m.f of the cell is 1.015 V. (dEdT)P of the cell is:
Answer» $d (Δ G) = - (Δ S_{reaction}) . d T$ $Δ G = Δ H - T Δ S$ $Δ G = Δ H + T {(\frac{d (Δ G)}{d T})}_{P}$ At $300 K, Δ H$ for the reaction, $Z n_{(S)} + 2 A g C l_{(S)} \to Z n C l_{2_{(a q)}} + 2 A g_{(S)}$ is $- 218 kJ/mol$ while the e.m.f of the cell is $1.015 V$ . ${(\frac{d E}{d T})}_{P}$ of the cell is:

Discussion

465.	Shikhar was to perform a neutralization reaction in laboratory. In order to neutralize 500 ml of 2M NaOH solution he was supposed to add certain volume of 1M H3PO3 solution, but by mistake, he added the same volume of water instead. What is the molality of the resulting solution – Assume density of the original solution = 1.08g/cc Density of water = 1 g/cc.
Answer» Shikhar was to perform a neutralization reaction in laboratory. In order to neutralize 500 ml of $2 M N a O H$ solution he was supposed to add certain volume of $1 M H_{3} P O_{3}$ solution, but by mistake, he added the same volume of water instead. What is the molality of the resulting solution – Assume density of the original solution = $1.08 g / c c$ Density of water = 1 g/cc.

Discussion

466.	For silver metal, the threshold frequency vo is 1.12×1017 Hz. What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of 15.0 oA wavelength on the metal?
Answer» For silver metal, the threshold frequency $v_{o}$ is $1.12 \times 10^{17} Hz$ . What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of $15.0 o A$ wavelength on the metal?

Discussion

467.	Which of the following statements is correct regarding case of dehydration in alcohols [CPMT 1980, 85; MP PMT 2001; BHU 2002]
Answer» Which of the following statements is correct regarding case of dehydration in alcohols [CPMT 1980, 85; MP PMT 2001; BHU 2002]

Discussion

468.	Which of the following aqueous solutions have been arranged in the order of their decreasing freezing points?
Answer» Which of the following aqueous solutions have been arranged in the order of their decreasing freezing points?

Discussion

469.	The probability factor for the replacement of hydrogen atom during chlorination/bromination is
Answer» The probability factor for the replacement of hydrogen atom during chlorination/bromination is

Discussion

470.	In the nucleophilic addition of CN- to carbonyl carbon, the intermediate formed is
Answer» In the nucleophilic addition of CN^- to carbonyl carbon, the intermediate formed is

Discussion

471.	Which of the following compound does not have restricted rotation?
Answer» Which of the following compound does not have restricted rotation?

Discussion

472.	For a gas having molar mass M, specific heat at constant pressure is given by:
Answer» For a gas having molar mass $M$ , specific heat at constant pressure is given by:

Discussion

473.	Which of the following is not an isomer of CH3−CH2−CHO ?
Answer» Which of the following is not an isomer of $C H_{3} - C H_{2} - C H O$ ?

Discussion

474.	Redox reaction involves transfer of electrons between 2 chemical species. An unbalanced and incomplete example is shown below:N2+H3PO2→HN3+P4O6If the above reaction were unidirectional towards right, what fraction of P4O6 would be left unreacted if reaction were started with stoichiometric amount of reactants.
Answer» Redox reaction involves transfer of electrons between 2 chemical species. An unbalanced and incomplete example is shown below: $N_{2} + H_{3} P O_{2} \to H N_{3} + P_{4} O_{6}$ If the above reaction were unidirectional towards right, what fraction of $P_{4} O_{6}$ would be left unreacted if reaction were started with stoichiometric amount of reactants.

Discussion

475.	The specific heats of iodine vapour and solid are 0.031 and 0.055 cal K−1 g−1 respectively. If heat of sublimation of iodine is 24 cal g−1 at 200oC, find its value at 250∘C.
Answer» The specific heats of iodine vapour and solid are $0.031$ and $0.055 c a l K^{- 1} g^{- 1}$ respectively. If heat of sublimation of iodine is $24 c a l g^{- 1}$ at $200^{o} C$ , find its value at $250^{\circ} C$ .

Discussion

476.	Innucleophilic addition reactions, the reactivities of carbonyl compounds NO2CH2CHO(I), ClCH2CHO(II), CH3CHO(III) and CH3CH2CHO (IV) are in the order of
Answer» Innucleophilic addition reactions, the reactivities of carbonyl compounds NO₂CH₂CHO(I), ClCH₂CHO(II), CH₃CHO(III) and CH₃CH₂CHO (IV) are in the order of

Discussion

477.	Total sum of α−H in major product(s) (alkene) of each of the following reactions.
Answer» Total sum of $α - H$ in major product(s) (alkene) of each of the following reactions.

Discussion

478.	For conversion of nitrile into aldehyde reagent A will be:
Answer» For conversion of nitrile into aldehyde reagent A will be:

Discussion

479.	Octet rule is not valid for which of the following compounds?
Answer» Octet rule is not valid for which of the following compounds?

Discussion

480.	In the given reaction:(a) C3H7−H\|C\|CH3−OHSOCl2/Pyridne−−−−−−−−−→[X] [X] will be:(a) C3H7−H\|C\|CH3−Cl (b) Cl−H\|C\|CH3−C3H7(c) Mixture of (a) and (b) (d) CH3−CH2−Cl\|C\|CH3−CH3
Answer» In the given reaction: $(a) C_{3} H_{7} - H \| C \| C H_{3} - O H S O C l_{2} / P y r i d n e - -------- \to [X]$ [X] will be: $(a) C_{3} H_{7} - H \| C \| C H_{3} - C l (b) C l - H \| C \| C H_{3} - C_{3} H_{7}$ $(c) M i x t u r e o f (a) a n d (b) (d) C H_{3} - C H_{2} - C l \| C \| C H_{3} - C H_{3}$

Discussion

481.	Which of the compounds contain both polar and non-polar bonds?
Answer» Which of the compounds contain both polar and non-polar bonds?

Discussion

482.	Calculate the wavelength of the radiation which would cause the photo-dissociation of chlorine molecule if the Cl-Cl bond energy is 243 kJ/mol.
Answer» Calculate the wavelength of the radiation which would cause the photo-dissociation of chlorine molecule if the Cl-Cl bond energy is 243 kJ/mol.

Discussion

483.	For a multielectron system, which of the following is/are the correct sequence of energy of orbitals?
Answer» For a multielectron system, which of the following is/are the correct sequence of energy of orbitals?

Discussion

484.	Here A or B is
Answer» Here A or B is

484.

Here A or B is

Answer»

Here A or B is

Discussion

485.	With increasing molecular mass of a liquid, the viscocity:
Answer» With increasing molecular mass of a liquid, the viscocity:

Discussion

486.	Which of the following is the least stable conformer of cyclohexane?
Answer» Which of the following is the least stable conformer of cyclohexane?

Discussion

487.	If dydx=xyx2+y2;y(1)=1; then a value of x satisfying y(x)=e is:
Answer» If $\frac{d y}{d x} = \frac{x y}{x^{2} + y^{2}}; y (1) = 1;$ then a value of $x$ satisfying $y (x) = e$ is:

Discussion

488.	The lattice energy of solid KCl is 181 kcalmol−1 and the enthalpy of solution of KCl in H2O is 1.0 kcalmol−1. If the hydration enthalpies of K+ and Cl− ions are in the ratio of 2:1, then the enthalpy of hydration of K+ is −x kcalmol−1. Find the value of x.
Answer» The lattice energy of solid KCl is $181 {kcalmol}^{- 1}$ and the enthalpy of solution of $K C l$ in $H_{2} O$ is $1.0 {kcalmol}^{- 1}$ . If the hydration enthalpies of $K^{+}$ and $C l^{-}$ ions are in the ratio of 2:1, then the enthalpy of hydration of $K^{+}$ is $- x {kcalmol}^{- 1}$ . Find the value of $x$ .

Discussion

489.	Do you know the molecular mass of glucose and its structural formula?
Answer» Do you know the molecular mass of glucose and its structural formula?

Discussion

490.	Starting out on a trip to the mountains, you inflate the tires on your automobile to a recommended pressure of 3.9×105 Pa on a day when the temperature is −13.0∘ C. You drive to the beach, where the temperature is 36.0∘ C. Assume that the volume of the tire has increased by 3%. What is the final pressure of air in the tires?
Answer» Starting out on a trip to the mountains, you inflate the tires on your automobile to a recommended pressure of $3.9 \times 10^{5} Pa$ on a day when the temperature is $- {13.0}^{\circ} C$ . You drive to the beach, where the temperature is ${36.0}^{\circ} C$ . Assume that the volume of the tire has increased by $3 %$ . What is the final pressure of air in the tires?

Discussion

491.	Hydrolysis of dimethyldichloro silane, (CH3)2SiCl2 followed by condensaiton polymerisation yields straight chain polymer of
Answer» Hydrolysis of dimethyldichloro silane, $(C H_{3})_{2} S i C l_{2}$ followed by condensaiton polymerisation yields straight chain polymer of

Discussion

492.	The energy of an electron in the first Bohr orbit of H - atom is - 13.6 eV. Then, which of the following statement(s) is/are correct for He+ ?
Answer» The energy of an electron in the first Bohr orbit of H - atom is - 13.6 eV. Then, which of the following statement(s) is/are correct for $H e^{+}$ ?

Discussion

493.	Which of the following is/ are the correct graphical representation of Boyle's Law?
Answer» Which of the following is/ are the correct graphical representation of Boyle's Law?

Discussion

494.	Which of the following cells have a cell potential which is the same as its standard value?
Answer» Which of the following cells have a cell potential which is the same as its standard value?

Discussion

495.	Stearic acid [CH3(CH2)16CO2H] is a fatty acid. 1.0 g of stearic acid was burned in a bomb calorimetre. The bomb had a heat capacity of 652J/∘C. If the temperature of 500 g water (c=4.18J/g ∘C) rose from 25.0 to 39.3 ∘C, how much heat was released when the stearic acid was burned? [Given Cp(H2O)=4.18J/g ∘C]
Answer» Stearic acid $[C H_{3} (C H_{2})_{16} C O_{2} H]$ is a fatty acid. $1.0 g$ of stearic acid was burned in a bomb calorimetre. The bomb had a heat capacity of $652 J /^{\circ} C$ . If the temperature of $500 g$ water $(c = 4.18 J / g^{\circ} C)$ rose from $25.0 t o 39.3^{\circ} C$ , how much heat was released when the stearic acid was burned? [Given $C_{p} (H_{2} O) = 4.18 J / g^{\circ} C]$

Discussion

496.	If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction.Suppose a gas mixture of F, Cl, Br, and I is irradiated with photons of frequency appropriate to ionize Cl. What ion(s) will be present in the mixture?
Answer» If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction. Suppose a gas mixture of F, Cl, Br, and I is irradiated with photons of frequency appropriate to ionize Cl. What ion(s) will be present in the mixture?

Discussion

497.	The condition such that the potential difference, VA−VB=0.
Answer» The condition such that the potential difference, $V_{A} - V_{B} = 0$ .

Discussion

498.	Electra has trouble finding the correct Nernst equation for the cell Zn(s)\|Zn2+\|\|Cu2+\|Cu(s) at 25∘CCan you help her?
Answer» Electra has trouble finding the correct Nernst equation for the cell $Z n (s) \| Z n^{2 +} \| \| C u^{2 +} \| C u (s) a t 25^{\circ} C$ Can you help her?

Discussion

499.	Match column I with column II: Column - IColumn - IIi. Cr(OH)3+H2O2 in basic mediump. CO+H2ii. Acidic KMnO4+H2O2q. NH3iii. Ca3N2+H2Or. Water-gasiv. Red-hot coke + steam (at 1273 K, Ni catalyst)s. Yellow solutiont. Ca(OH)2u. Solution decolourised
Answer» Match column I with column II: $\begin{matrix} Column - I & Column - II i. C r (O H)_{3} + H_{2} O_{2} in basic medium & p. C O + H_{2} ii. Acidic K M n O_{4} + H_{2} O_{2} & q. N H_{3} iii. C a_{3} N_{2} + H_{2} O & r. Water-gas iv. Red-hot coke + steam (at 1273 K, Ni catalyst) & s. Yellow solution t. C a (O H)_{2} u. Solution decolourised \end{matrix}$

Discussion

500.	Which of the following is the smallest in size?
Answer» Which of the following is the smallest in size?

500.

Which of the following is the smallest in size?

Answer»

Which of the following is the smallest in size?

Discussion

Explore topic-wise InterviewSolutions in .

Consider the following transformations. H−C≡C−CH2−CH2−CH3→H3C−CH=CH−CH2−CH3Which reaction sequence will bring about the above transformation?

The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is

When 3, 3-dimethyl-2-butanol is heated with H2SO4the major product obtained is

Which of the assumption of the kinetic - molecular theory best explains Daltons law of partial pressure?

Which of the following is the correct statement for red lead

Calculate the wavelength of a photon having an energy of 3 eV. Take h=6.6×10−34 Js

An organic compound contains C,H and S the minimum molecular weight of the compound containing 10% sulphur is : (atomic weight of S=32 amu)

Which of the following is not an ore of copper?

For the reaction CaCO3(s) ⇋ CaO(s) + CO2(g) the partial pressure of CO2 (at equilibrium) depends on:

Enthalpy change for the reaction H+(aq)+OH−(aq)⟶H2O(l) IS−57.3 kJ mol−1. If 1 L of 0.5 MJNO3 is mixed with 2L of 0.1 MKOH, the enthalpy change would be

By the reduction of alkyl halides, we get alkanes. The best alkyl halide is

Assertion (A): Hydrogen resembles alkali metals. Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K). Choose the most appropriate of the following:

In a reaction, A+B→ Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as :

d(ΔG)=−(ΔSreaction).dT ΔG=ΔH−TΔS ΔG=ΔH+T(d(ΔG)dT)PAt 300 K,ΔH for the reaction,Zn(S)+2AgCl(S)→ZnCl2(aq)+2Ag(S)is −218 kJ/mol while the e.m.f of the cell is 1.015 V. (dEdT)P of the cell is:

For silver metal, the threshold frequency vo is 1.12×1017 Hz. What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of 15.0 oA wavelength on the metal?

Which of the following statements is correct regarding case of dehydration in alcohols [CPMT 1980, 85; MP PMT 2001; BHU 2002]

Which of the following aqueous solutions have been arranged in the order of their decreasing freezing points?

The probability factor for the replacement of hydrogen atom during chlorination/bromination is

In the nucleophilic addition of CN- to carbonyl carbon, the intermediate formed is

Which of the following compound does not have restricted rotation?

For a gas having molar mass M, specific heat at constant pressure is given by:

Which of the following is not an isomer of CH3−CH2−CHO ?

The specific heats of iodine vapour and solid are 0.031 and 0.055 cal K−1 g−1 respectively. If heat of sublimation of iodine is 24 cal g−1 at 200oC, find its value at 250∘C.

Innucleophilic addition reactions, the reactivities of carbonyl compounds NO2CH2CHO(I), ClCH2CHO(II), CH3CHO(III) and CH3CH2CHO (IV) are in the order of

Total sum of α−H in major product(s) (alkene) of each of the following reactions.

For conversion of nitrile into aldehyde reagent A will be:

Octet rule is not valid for which of the following compounds?

In the given reaction:(a) C3H7−H|C|CH3−OHSOCl2/Pyridne−−−−−−−−−→[X] [X] will be:(a) C3H7−H|C|CH3−Cl (b) Cl−H|C|CH3−C3H7(c) Mixture of (a) and (b) (d) CH3−CH2−Cl|C|CH3−CH3

Which of the compounds contain both polar and non-polar bonds?

Calculate the wavelength of the radiation which would cause the photo-dissociation of chlorine molecule if the Cl-Cl bond energy is 243 kJ/mol.

For a multielectron system, which of the following is/are the correct sequence of energy of orbitals?

Here A or B is

With increasing molecular mass of a liquid, the viscocity:

Which of the following is the least stable conformer of cyclohexane?

If dydx=xyx2+y2;y(1)=1; then a value of x satisfying y(x)=e is:

The lattice energy of solid KCl is 181 kcalmol−1 and the enthalpy of solution of KCl in H2O is 1.0 kcalmol−1. If the hydration enthalpies of K+ and Cl− ions are in the ratio of 2:1, then the enthalpy of hydration of K+ is −x kcalmol−1. Find the value of x.

Do you know the molecular mass of glucose and its structural formula?

Hydrolysis of dimethyldichloro silane, (CH3)2SiCl2 followed by condensaiton polymerisation yields straight chain polymer of

The energy of an electron in the first Bohr orbit of H - atom is - 13.6 eV. Then, which of the following statement(s) is/are correct for He+ ?

Which of the following is/ are the correct graphical representation of Boyle's Law?

Which of the following cells have a cell potential which is the same as its standard value?

The condition such that the potential difference, VA−VB=0.

Electra has trouble finding the correct Nernst equation for the cell Zn(s)|Zn2+||Cu2+|Cu(s) at 25∘CCan you help her?

Match column I with column II: Column - IColumn - IIi. Cr(OH)3+H2O2 in basic mediump. CO+H2ii. Acidic KMnO4+H2O2q. NH3iii. Ca3N2+H2Or. Water-gasiv. Red-hot coke + steam (at 1273 K, Ni catalyst)s. Yellow solutiont. Ca(OH)2u. Solution decolourised

Which of the following is the smallest in size?